Hi, I have two tubes from the same patient; one is gel-serum tube (yellow cap), the other is EDTA whole blood (mauve cap), when I centrifuged the gel-serum tube the serum came out bloody (reddish). I need the serum for Vitamin analysis, can I obtain another serum from the frozen whole blood tube or is there is a way to clean the serum sample?

Please help.

P.S. The color of the resulting serum is between the two colors in the image attached